Improvement in springs



UNITED STATES PATENT. OFFICE.

THOMAS SHAW, or PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN SPRINGS.

Specification forming part of Letters Patent No. 47,663. dated May 9, 1865.`

To all whom it may concern Be it known that l, THOMAS SHAW, of the city and county of Philadelphia, Pennsylvania, have invented a new and Improved Mode ot Gonstructin g Spring-Plates 5 and Ihereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawing and to the letters of reference marked thereon.

My invention consists in forming a nib under a groove, for the purpose as hereniaf'ter described.

In order to enable others to use and practice my invention, I will proceed to describe its construction and object.

On reference to the accompanying drawing, which forms a part of this specification, the sketch represents a longitudinal vertical section through the center of an ordinary freightcar spring with ends cut on, of which a represents the plates of ordinary spring steel,

through the center of which is a bolt, b, for the purpose of holding them in position. c and d represent the groove and nib, which alternately lock into each other for the purpose of preventing lateral motion of the plates. This groove and nib are formed in an ordinary punching-machine by having a punch of the congurature of the groove and a die of a.

shape corresponding to the form of nib d.

VIt will be observed that this mode of con- 

